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4e10d12a DSL |
1 | /* |
2 | * Link physical devices with ACPI devices support | |
3 | * | |
4 | * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com> | |
5 | * Copyright (c) 2005 Intel Corp. | |
6 | * | |
7 | * This file is released under the GPLv2. | |
8 | */ | |
9 | #include <linux/init.h> | |
10 | #include <linux/list.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/rwsem.h> | |
13 | #include <linux/acpi.h> | |
14 | ||
15 | #define ACPI_GLUE_DEBUG 0 | |
16 | #if ACPI_GLUE_DEBUG | |
17 | #define DBG(x...) printk(PREFIX x) | |
18 | #else | |
4ebf83c8 | 19 | #define DBG(x...) do { } while(0) |
4e10d12a DSL |
20 | #endif |
21 | static LIST_HEAD(bus_type_list); | |
22 | static DECLARE_RWSEM(bus_type_sem); | |
23 | ||
24 | int register_acpi_bus_type(struct acpi_bus_type *type) | |
25 | { | |
26 | if (acpi_disabled) | |
27 | return -ENODEV; | |
28 | if (type && type->bus && type->find_device) { | |
29 | down_write(&bus_type_sem); | |
30 | list_add_tail(&type->list, &bus_type_list); | |
31 | up_write(&bus_type_sem); | |
4be44fcd LB |
32 | printk(KERN_INFO PREFIX "bus type %s registered\n", |
33 | type->bus->name); | |
4e10d12a DSL |
34 | return 0; |
35 | } | |
36 | return -ENODEV; | |
37 | } | |
38 | ||
4e10d12a DSL |
39 | int unregister_acpi_bus_type(struct acpi_bus_type *type) |
40 | { | |
41 | if (acpi_disabled) | |
42 | return 0; | |
43 | if (type) { | |
44 | down_write(&bus_type_sem); | |
45 | list_del_init(&type->list); | |
46 | up_write(&bus_type_sem); | |
4be44fcd LB |
47 | printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n", |
48 | type->bus->name); | |
4e10d12a DSL |
49 | return 0; |
50 | } | |
51 | return -ENODEV; | |
52 | } | |
53 | ||
4e10d12a DSL |
54 | static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type) |
55 | { | |
56 | struct acpi_bus_type *tmp, *ret = NULL; | |
57 | ||
58 | down_read(&bus_type_sem); | |
59 | list_for_each_entry(tmp, &bus_type_list, list) { | |
60 | if (tmp->bus == type) { | |
61 | ret = tmp; | |
62 | break; | |
63 | } | |
64 | } | |
65 | up_read(&bus_type_sem); | |
66 | return ret; | |
67 | } | |
68 | ||
69 | static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle) | |
70 | { | |
71 | struct acpi_bus_type *tmp; | |
72 | int ret = -ENODEV; | |
73 | ||
74 | down_read(&bus_type_sem); | |
75 | list_for_each_entry(tmp, &bus_type_list, list) { | |
76 | if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) { | |
77 | ret = 0; | |
78 | break; | |
79 | } | |
80 | } | |
81 | up_read(&bus_type_sem); | |
82 | return ret; | |
83 | } | |
84 | ||
4e10d12a DSL |
85 | /* Get device's handler per its address under its parent */ |
86 | struct acpi_find_child { | |
87 | acpi_handle handle; | |
88 | acpi_integer address; | |
89 | }; | |
90 | ||
91 | static acpi_status | |
92 | do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv) | |
93 | { | |
94 | acpi_status status; | |
95 | struct acpi_device_info *info; | |
96 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
50dd0969 | 97 | struct acpi_find_child *find = context; |
4e10d12a DSL |
98 | |
99 | status = acpi_get_object_info(handle, &buffer); | |
100 | if (ACPI_SUCCESS(status)) { | |
101 | info = buffer.pointer; | |
102 | if (info->address == find->address) | |
103 | find->handle = handle; | |
02438d87 | 104 | kfree(buffer.pointer); |
4e10d12a DSL |
105 | } |
106 | return AE_OK; | |
107 | } | |
108 | ||
109 | acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address) | |
110 | { | |
111 | struct acpi_find_child find = { NULL, address }; | |
112 | ||
113 | if (!parent) | |
114 | return NULL; | |
115 | acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, | |
116 | 1, do_acpi_find_child, &find, NULL); | |
117 | return find.handle; | |
118 | } | |
119 | ||
120 | EXPORT_SYMBOL(acpi_get_child); | |
121 | ||
122 | /* Link ACPI devices with physical devices */ | |
123 | static void acpi_glue_data_handler(acpi_handle handle, | |
124 | u32 function, void *context) | |
125 | { | |
126 | /* we provide an empty handler */ | |
127 | } | |
128 | ||
129 | /* Note: a success call will increase reference count by one */ | |
130 | struct device *acpi_get_physical_device(acpi_handle handle) | |
131 | { | |
132 | acpi_status status; | |
133 | struct device *dev; | |
134 | ||
135 | status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev); | |
136 | if (ACPI_SUCCESS(status)) | |
137 | return get_device(dev); | |
138 | return NULL; | |
139 | } | |
140 | ||
141 | EXPORT_SYMBOL(acpi_get_physical_device); | |
142 | ||
22c13f9d TR |
143 | /* ToDo: When a PCI bridge is found, return the PCI device behind the bridge |
144 | * This should work in general, but did not on a Lenovo T61 for the | |
145 | * graphics card. But this must be fixed when the PCI device is | |
146 | * bound and the kernel device struct is attached to the acpi device | |
147 | * Note: A success call will increase reference count by one | |
148 | * Do call put_device(dev) on the returned device then | |
149 | */ | |
150 | struct device *acpi_get_physical_pci_device(acpi_handle handle) | |
151 | { | |
152 | struct device *dev; | |
153 | long long device_id; | |
154 | acpi_status status; | |
155 | ||
156 | status = | |
157 | acpi_evaluate_integer(handle, "_ADR", NULL, &device_id); | |
158 | ||
159 | if (ACPI_FAILURE(status)) | |
160 | return NULL; | |
161 | ||
162 | /* We need to attempt to determine whether the _ADR refers to a | |
163 | PCI device or not. There's no terribly good way to do this, | |
164 | so the best we can hope for is to assume that there'll never | |
165 | be a device in the host bridge */ | |
166 | if (device_id >= 0x10000) { | |
167 | /* It looks like a PCI device. Does it exist? */ | |
168 | dev = acpi_get_physical_device(handle); | |
169 | } else { | |
170 | /* It doesn't look like a PCI device. Does its parent | |
171 | exist? */ | |
172 | acpi_handle phandle; | |
173 | if (acpi_get_parent(handle, &phandle)) | |
174 | return NULL; | |
175 | dev = acpi_get_physical_device(phandle); | |
176 | } | |
177 | if (!dev) | |
178 | return NULL; | |
179 | return dev; | |
180 | } | |
181 | EXPORT_SYMBOL(acpi_get_physical_pci_device); | |
182 | ||
4e10d12a DSL |
183 | static int acpi_bind_one(struct device *dev, acpi_handle handle) |
184 | { | |
1071695f | 185 | struct acpi_device *acpi_dev; |
4e10d12a DSL |
186 | acpi_status status; |
187 | ||
465ae641 | 188 | if (dev->archdata.acpi_handle) { |
fc3a8828 | 189 | dev_warn(dev, "Drivers changed 'acpi_handle'\n"); |
4e10d12a DSL |
190 | return -EINVAL; |
191 | } | |
192 | get_device(dev); | |
193 | status = acpi_attach_data(handle, acpi_glue_data_handler, dev); | |
194 | if (ACPI_FAILURE(status)) { | |
195 | put_device(dev); | |
196 | return -EINVAL; | |
197 | } | |
465ae641 | 198 | dev->archdata.acpi_handle = handle; |
4e10d12a | 199 | |
1071695f DB |
200 | status = acpi_bus_get_device(handle, &acpi_dev); |
201 | if (!ACPI_FAILURE(status)) { | |
202 | int ret; | |
203 | ||
204 | ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, | |
205 | "firmware_node"); | |
206 | ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, | |
207 | "physical_node"); | |
76acae04 | 208 | if (acpi_dev->wakeup.flags.valid) { |
eb9d0fe4 | 209 | device_set_wakeup_capable(dev, true); |
76acae04 RW |
210 | device_set_wakeup_enable(dev, |
211 | acpi_dev->wakeup.state.enabled); | |
212 | } | |
1071695f DB |
213 | } |
214 | ||
4e10d12a DSL |
215 | return 0; |
216 | } | |
217 | ||
218 | static int acpi_unbind_one(struct device *dev) | |
219 | { | |
465ae641 | 220 | if (!dev->archdata.acpi_handle) |
4e10d12a | 221 | return 0; |
465ae641 | 222 | if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) { |
1071695f DB |
223 | struct acpi_device *acpi_dev; |
224 | ||
4e10d12a DSL |
225 | /* acpi_get_physical_device increase refcnt by one */ |
226 | put_device(dev); | |
1071695f DB |
227 | |
228 | if (!acpi_bus_get_device(dev->archdata.acpi_handle, | |
229 | &acpi_dev)) { | |
230 | sysfs_remove_link(&dev->kobj, "firmware_node"); | |
231 | sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node"); | |
232 | } | |
233 | ||
465ae641 BH |
234 | acpi_detach_data(dev->archdata.acpi_handle, |
235 | acpi_glue_data_handler); | |
236 | dev->archdata.acpi_handle = NULL; | |
4e10d12a DSL |
237 | /* acpi_bind_one increase refcnt by one */ |
238 | put_device(dev); | |
239 | } else { | |
fc3a8828 | 240 | dev_err(dev, "Oops, 'acpi_handle' corrupt\n"); |
4e10d12a DSL |
241 | } |
242 | return 0; | |
243 | } | |
244 | ||
245 | static int acpi_platform_notify(struct device *dev) | |
246 | { | |
247 | struct acpi_bus_type *type; | |
248 | acpi_handle handle; | |
249 | int ret = -EINVAL; | |
250 | ||
251 | if (!dev->bus || !dev->parent) { | |
252 | /* bridge devices genernally haven't bus or parent */ | |
253 | ret = acpi_find_bridge_device(dev, &handle); | |
254 | goto end; | |
255 | } | |
256 | type = acpi_get_bus_type(dev->bus); | |
257 | if (!type) { | |
ef7b06cd | 258 | DBG("No ACPI bus support for %s\n", dev->bus_id); |
4e10d12a DSL |
259 | ret = -EINVAL; |
260 | goto end; | |
261 | } | |
262 | if ((ret = type->find_device(dev, &handle)) != 0) | |
ef7b06cd | 263 | DBG("Can't get handler for %s\n", dev->bus_id); |
4e10d12a DSL |
264 | end: |
265 | if (!ret) | |
266 | acpi_bind_one(dev, handle); | |
267 | ||
268 | #if ACPI_GLUE_DEBUG | |
269 | if (!ret) { | |
270 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
271 | ||
465ae641 BH |
272 | acpi_get_name(dev->archdata.acpi_handle, |
273 | ACPI_FULL_PATHNAME, &buffer); | |
4e10d12a | 274 | DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer); |
02438d87 | 275 | kfree(buffer.pointer); |
4e10d12a DSL |
276 | } else |
277 | DBG("Device %s -> No ACPI support\n", dev->bus_id); | |
278 | #endif | |
279 | ||
280 | return ret; | |
281 | } | |
282 | ||
283 | static int acpi_platform_notify_remove(struct device *dev) | |
284 | { | |
285 | acpi_unbind_one(dev); | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static int __init init_acpi_device_notify(void) | |
290 | { | |
291 | if (acpi_disabled) | |
292 | return 0; | |
293 | if (platform_notify || platform_notify_remove) { | |
294 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
295 | return 0; | |
296 | } | |
297 | platform_notify = acpi_platform_notify; | |
298 | platform_notify_remove = acpi_platform_notify_remove; | |
299 | return 0; | |
300 | } | |
301 | ||
302 | arch_initcall(init_acpi_device_notify); |